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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70eadcb3c2249a57f42405830145d0cc25902bb6f79d9f4de63c942e926c8de4' 
  AND token = '4s/9lzL2KcKVpV7GdBnTrN6xfXVu3NjywoXSbdCd1IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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