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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf9ee6e25f25baa67a948e5707f1520d899e9808d5a6cb973330c4c283a1e53f' 
  AND token = 'J5vjzSmH05rR9DGpbbc9GoW9Z6KW9bCegZLDE/jMIMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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