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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3dd56f4c03dd30a8d71eaaeb52353693fc2035c3d767faba58ba981a7c565a4' 
  AND token = '8tWDOIuApeNOAQ/7tjQ+8XZSuGlVTTfnj4Nds313a6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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