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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd70b84f0da4291c52b2adb56805290d714b6796e8ebd1da28863db24958d6a0e' 
  AND token = '48/qL/MphUfgTeSMY2a3VX6+hoXQt8FEYP3D8ACIUdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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