SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b310c3a7fc325e981d55a94b3896ca91214173a75eb77814b07e20342f28565f' 
  AND token = '1DJtHxnXBjFxFd5QlKNtFQ6HFHjn+3JbUVGLpu8XIG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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