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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4504b30f379504bed665c488efe8bd4455acd3b7d6e1923366cce94f8339c185' 
  AND token = 'XKVGehQUPnvuE2tisVo4o7PWIG4cTymcmqfOhJbti1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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