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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8867ce299fcd40d99b74128085e9d0616a7cc62e74a305dd790675edc5b44194' 
  AND token = '/Uuy6B942NNle3Ggh7vtQQIGyUObAyBUb+3d9rqDkLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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