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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3202e3b7b16b152a0fee03d95fd569ffeeeab40db1ef072ec22d8e1df9caa1db' 
  AND token = 'LlmOHxftmG3ctZ999GbCaqAqoK+Qppeu1qboczSH75w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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