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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb92da40f1780c6eba21c376ed67bee1a8edbfa342e0bbf8a37adbb3d6e90d12' 
  AND token = 'djed4pe7REH8rgZrXooaJB6n3BDAU8KpVfDzKB1/ZeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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