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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '441eb97d009ee0584533034d51be3596fd80fb918ff13633f2ed348fcb71aea0' 
  AND token = 'VlkAhdlt+ueY8jFn6Spj71ttQtiNFgC03r94fMd/Eak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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