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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55fbf98aa0cae2e6b8fbe53950e563c90b8dd263183f12ab09bb77fd9f9bc052' 
  AND token = 'u/OYpYD6iJZ1HkSQnyguxJdpkf59GgsSUtjZDyL1adI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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