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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc910657949be3eeab055297c6ca72da0abdd21ad183a5ec80eb04a908ad0c86' 
  AND token = 'yp5BIC8jMOTGrPwSGUmbw9i8AoiluQ65VVYbSse2EZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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