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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7201e594779cb31946657cf204d606eaed88bc96ce2907a118c4a7c6e309aa36' 
  AND token = 'T6abnuRzfzMA9K1OjVRErilXvHPXDj48LUkJIgTak5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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