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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5de8d13ac3d43b300f27e13587698d04119bb976166e06966e11c35e0193bac5' 
  AND token = 'oVDMQMoV6FJH+sw0gdgs1uv8Dd5DALQukfQtF+4Pz44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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