SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7566c8320efd4703fea8cfbb963f9cadba83f43102f8531ff4c7905e13a7244' 
  AND token = 'fAQKwgVYaedWVy+gJTV6lUXw3r73IjGefAoPkFVDuG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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