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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc78a80678df069c80cc89be30d97d1b85b7d772e18f9a585af084c994423649' 
  AND token = '3YjdoKWV6lCqlQiqN3eZcp5vcuLO2s8bQAP5cyu3lq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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