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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e6f0b2ba3751912a638c66e856fe38a01c493a2cc12a2d488f701ab0b1ad6a9' 
  AND token = 'LnEoFgUYyPzzFSaJ9uDyAgyJyR4isZQH9y3+YuAVieU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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