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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0573438f241276769b5cf77c9518e80b8aca869e601557a8cc372af79f0e78dd' 
  AND token = 'Ufi5m6weaEUM8QB55rrdc5/kEhufLY+FV4zQ95dKH8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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