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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cd781c05bd87b989bc3aca9ba71348a3bf0203bb6f974594fdd8baa61e4a397' 
  AND token = '1i0OjaJelzJ6Xu7Zu78USgL+eYsQBiUe7L5E/1S+Oj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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