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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97a92035e7e09286d75137c7a4ab5ca329b5d766f7bf6c6da53baeacd7674de5' 
  AND token = 'dd6HknPNKqPCY8aVyJYDZ8oQe4TlJXs1cwAusC/3JiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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