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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b4e6e44855571a51825621b54e97bc33e63692e3919867a0849047d5a5cf0ea' 
  AND token = 'KVOgDBSy88pmB6CrEyWWcptxek0oavXuIEiOfxb5XpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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