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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90467b4911affbd4275828c304d0e4bed623f351fa7de19ee4a93ed502a9c74f' 
  AND token = 'b8drR6S2Qu4y7HzbIk84Kg2hQGvtz9q7hpoOp6emEWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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