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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '671de620122dfbb9fe147c1714ae98b60ae7b7f2aecc321dd25d80db8df8a4cd' 
  AND token = '5b/oYk38NwD9sX62T2UHp/v/ZoaCeJn0bYhdiUNBuNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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