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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c22ce617dcbf021aee2f1301c3a666a52822e6f2504e7c03554ab4a37b27b69d' 
  AND token = 'Pva0XyA7xT+iEMqPqdKp7G/sCnSZV2OTgLfvUs+uUso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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