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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da5111d9a946c55d498cd7096c98d08c1d1342cf9756c1a227b2e5e7fd0a6ee3' 
  AND token = 'vBV4/tyjT/H+TTj5t+Sf2d1jsUJs1AzGfLjElwFT0lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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