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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af3597344eb55e6d16c76a7c4d361456e8395f61d58dffd520f59428153ba110' 
  AND token = 'I5KWzRxaGCQQJGoilA1rwlpmAKFphaFHPDRR1HlluPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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