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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dbaa08d96ce8eaf8b7aa020df64351d474aceb3c8ee9b33a3bada5691ea6567' 
  AND token = '+yqnMQSTMVPTVatg4dVh2MH6LWZtYiFfKYXBlnt1gSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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