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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9dca06a6d4cd9a6bbf77a5acaa1dd7ee4d4e4143ea629c360ff9e09b6edd1fc' 
  AND token = 'ed1jHfVh1AscoPKaVWIw+afWSyASEohmIhA//m5J8Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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