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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d0b882f0e522d0258f0e44020aaa3d002378f46a6acfb8a42e61fee62085409' 
  AND token = 'SHl/An6n57SYUrzNbqBxpcweYnU8VlcfmBg5I4Svyh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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