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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69c107a9cbc840c708602a42424ef68c1294116991ef6656ad8eaee8d6b32263' 
  AND token = '40dU/1OYV6SvFXeY2bwNV87uO8ICLC/tc+2LZBj+EZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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