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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21119d3e084ea632ee03eb342bdcd17cc9ea08be5047a1b82dab6c2d1b85769d' 
  AND token = 'ieAiWU3jXhw31hEWd11RQLJWGsVIhXLqXcfHURtaX98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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