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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9744fbd80419487aa23a48697c2c65f5aa0056c8766209faaceaae57f48a6c7f' 
  AND token = '2heJQ6jmjHmX4AOmrXZ1JXRxeN49/yHvqcCUiRJgCU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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