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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40f4122bd0dfe665455a7191d6bd0f240e4f82062b4db0fc440806f6a1d05df3' 
  AND token = 'XW1AeYxqJfcONqC12asOOjKMJ5tjW8z9z3/U7jJ7y28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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