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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b82364ce3233af39053b8a473702a01dd3562bd25cc684b3ebc345cf1eae7ce' 
  AND token = '17Q2v/xrce+MqePs155RBkvqQK5CWdlF4lSdLkUorbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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