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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc6018196d8905e25a7ce8a4ef02176a238f44f691db747f80a4657c21a00164' 
  AND token = '3g7dtz6WoNFlDbx58p0ETlM4YOer44GmoHM0qONy1i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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