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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f91622ae4fd70ebdc62fd673e7dad154b70c6c72ad00fa642eaab9858f8c2514' 
  AND token = 'LVu7CanEOktwY5Ks1quqtBK6Yl4olOd1pHT7q21flHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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