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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a802e7f483623d819ec06eff97d6937328007032de41af9a185a4eb7267b3770' 
  AND token = '/HYP5Cr1pnYWzO0hLlLQY3WsmCjj8V2UXthyjtV9018=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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