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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '675888a48216154cf8e71078c5ea706ca9aba48e8aeb392efc3263900d929132' 
  AND token = 'gB3okf074jVJDDQabwTA5sVtydjAujbdqmcqZLZr5Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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