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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e55ab5f67ea49d965db32aae1ac522739a6c63278afbe7074336c3fe54165589' 
  AND token = 'Jwk1OYmUFxeOvs6Hm3M8ZcNqT+mIppaRA/XGvI83aXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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