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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c70bb7011e6a71d558bc5c861ebe7fb50728c3f63a7a73d4964bb98221118b7a' 
  AND token = 'HRPBuA9B7AlfToDV+O0kHpP3CvQnPP7dWEP+OKw29OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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