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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67c4b18b9ba1e9ca51baff5b2257610d7226ee8056fefb989c03b852ea3b34e3' 
  AND token = '8lZMxQTmd0jWMa2QtdN3rCZAPpFWTXG2+OKxUfhkFZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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