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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '013f5f38ac48460ece3ff040d1a24e7f11159c9801fd09aa557e2bd4208fb827' 
  AND token = 'wPNfBh4OEaW0Ddn7X8VCQj4WtTmg+AAqW0gNqOiRtpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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