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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1be0925824d1317972c11c173bd80a3318ed38fa44028cf27f1f815350932a9a' 
  AND token = '/fn2spBaWOhcoWkiKBor0qg1d+a/UqBp+vHrA8dsHX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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