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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b699e47947d683a0478a7f51a8a32018c4e3605097f282c1d8c0dc719a70e5b4' 
  AND token = 'NcAnESCH158jQUhxkWtUpH/ef2/CLw9bVOfeLmA55nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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