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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a1b657c1427255a40981daeb7802b8eb2b3a52aac5a16692b93dd29558a6e97' 
  AND token = 'uRirQzfNw2gT9FsO22uYGGuU+V6XWI3TGgA9eyh6c0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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