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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88cf7519ddf76af4f5c70cd614c613529aaf4647cfe71789b9359eeed5459057' 
  AND token = 'Q0NKkUHmTKCiDjFQyiX/jvEYqcDEbbczUW+rwyxSiDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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