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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04f3773535106e93b3c2368f85e3e4efd28f3dfce028314be5cb13534fd113d4' 
  AND token = 'bW7Hh3OH/TL+dbbgq+0empZ3o06xwbgJoxP4HA0wL4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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