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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '935bb2c10e126a6a2ad54d9bc7d5d923c6a68a14bd34fea5360105c1a1665e02' 
  AND token = 'HSEeP6tRrVV2w8fi2Edy3b+fgv9b7ZlWoE787yMD2t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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