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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b5796c28e658c0963815ca1867382f96df4fca8829389c04952fcdcb5641991' 
  AND token = 'U9329qoffDTV2GloVAH2lsYc4pleTW+Rx8RRdRYTyFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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