SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64166f7f370e17d228b84b6b6d91de622146e9c2b538cdb5fb27b696454f27a6' 
  AND token = 'PelVe/G+oCtFdWDD6Wc6gLJSQvP/oa/Z3VL2N0AUnY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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