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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7141fcfba756eb855286f098abecda5a93ca96b1044ac8700d22ac9831e2451c' 
  AND token = '/QTEH4aQf9cBxWnx9Qv/t/A+LljJ7MjAAXD2jkIj9iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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