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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a6fcfa9e19b9241aacaf60d42ca08d938ddd9a6670f72cf2220c2e20b26a600' 
  AND token = 'F/yJBSnoSELqo5CjD9+gQaQdDwzhsA1VrrK5C80yi/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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