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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd40acbd00178a323f82ee146560f5ecdada096b1987726b245a00d4f353c9d98' 
  AND token = 'gTknAk/SrDAVIg7fxqbgS3DmHObQgy3dNwhAgK6UCGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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