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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8cbf0ab9ef0e7d620c744b82651a83654effe45fcd06b2f2b81e200ea368d5e' 
  AND token = 'HFMBTlRN/GJvrcevG6tWk5PgyymRT4j6ZNbfeHa5z7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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