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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a3eea2109b4ae48122a2d81a2e8e0192cf1ba10b33cc1cd8788548523686d7e' 
  AND token = 'kZiYCNXBwLUxmKvMEiIcf6yI4pJqJrHO83smT4hoah0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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