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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a57beab0aa20f867675eb0201a79c80290fe1b5b22786b39bde6c8bd6249af3b' 
  AND token = 'G5R14o09jZkYhpz2yHhCk927cOyc0tA+7hLXDDKFwAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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