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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dafc8bdbf051e429d4fa1f643c5d3fc31153ebc51f1b7ba73f7b78eadc7b15b' 
  AND token = 'pIVbPF2J4lQD90ouCz99BYQfotLOnxD/WUsRb2FpqII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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