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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68bf52759d15b4e1e271a66395223bdfd65e91043cbeaeb45d7bbf27af94fcc6' 
  AND token = '4qBb3qKdbRWBV4yhRUbbUPuba3pB937a06G/ErOP2Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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