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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c512ad8f7380ae9e3542b4edfef2599cb97f39db0c6db1bcf51f0027b917a7ad' 
  AND token = '2wavi3a2Q/EB62qWkHBkTb4gMP6eCdFVIcshI1K2QfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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