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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b45194fa687100ddc6e4e76c37debb0268d8a78fd1685ef9251e3688b31ee4c' 
  AND token = 'xFBbfT2ML0GymvU8l2NsWeNkV4QOsyJw8fg2orNEj7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}