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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c57c98b5fff7a02f78c4b1a3375916b4cb392889d74295005a1a84f9b54d9c65' 
  AND token = 'N8yQI7CpYYLciFMZyFFJIEjS7AtIq3Xpu/OkpIAeJfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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