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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3854e2406e789d5d7eaea732cdd6e9255b191855c4cd7408da7d876bfeda5d13' 
  AND token = 'k5HklEpsW1/Q81AwQkql0KccofnbMmolC7t0lu4ZoN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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