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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df1cf7dd6439395cf14ef4c2550e808c8e2f63fa7fc8c42cda9bed093f14dcdb' 
  AND token = '01v5L2egtrBY/2mUGfhTCmn7bHZmkflAOFb7IXxsHSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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