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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb24abaa1d84181203f021573cb8787e84246683e62dc62e560c6a912a616a21' 
  AND token = '75FHUOO1OGTN49zkG/hd1sbp1qdjJahJ/qxKTA/7GPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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