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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e2b4a15a3f912eedc5825c560ed4bf584aa16788c69e720e37492e2cb4699b7' 
  AND token = '8tf6yt82Az+v30SGrPw0qTlluxpd4LwPtJ2WFWkdyfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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